How often do you have to ask people to repeat themselves?

How often do you either mishear what people say or not hear what people say, when you're paying attention?

I ask because I kept track of the number of times I had to ask people to repeat themselves or just didn't hear what they said in a single day and the total was over seventy times. I'm pretty sure this isn't normal, but I'd like to know what most people experience.

Thanks!